<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="product.id" readonly>
  <input type="text" v-model="product.title">
  <input type="text" v-model="product.price">
  <input type="text" v-model="product.num">
  <input type="button" value="修改商品" @click="update">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
          product:{
            id:"", title:"", price:"", num:""
          }
        },
        methods:{
          update(){
              //发出异步修改请求
              axios.post("/update",v.product).then(function (response) {
                  alert("修改完成!");
                  location.href="list.html";//返回列表页面
              })
          }
        },
        created:function () {
            //发送请求获取商品的信息
            //location.search得到?以及参数  ?id=3
            axios.get("/selectById"+location.search).then(function (response) {
                v.product = response.data;
            })
        }
    })
</script>
</body>
</html>